pt: refact training code #5875

Job	Run time
Build source distribution	17s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	5m 26s
Build wheels for cp311-manylinux_x86_64	7m 2s
Build wheels for cp311-macosx_x86_64	5m 37s
Build wheels for cp311-macosx_arm64	4m 4s
Build wheels for cp311-win_amd64	6m 8s
Build wheels for cp310-manylinux_aarch64	5m 35s
build_pypi_index	12s
build_docker (12)	6m 15s
upload_pypi	0s
build_docker (_cu11, 11)	3m 45s
deploy_pypi_index	0s
Pass testing build wheels	2s
	44m 24s

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